Process and apparatus for applying abrasive to grinding apparatus



C. BROWN FOR APPLYING ABRASIVE TO PROCESS AND APPARATUS GRINDING APPARATUS .11.... l l I I l I llf UNITED srA'rss Patented Oct. 13, 1925.

CERISTOPHEB BROWN. CHARIIEROL BENNSYLVANIA, ASSIGNOR TO PITTSBURGH I PLATE GLASS COMPANY, A CORPORATION QF-IENKSYLVANIA;

raocsss Am) srraaa'rus son Assume Asaaswa'ro onmnmc APPARATUS.

Applioatioufiled February aim. serial in. 61 ,160.

To all whom it may concern Be it know? ha Cnnrs'rorirnn Bnowx, a citizen of t, I nnied States, and a resident of Charleroi, in the county of Wash- .ington and Stateof Pennsylvania, have I made a new and useful vInvention in Process and Apparatus for Applying Abrasive to Grinding Ap aratus, of which the follow ing is a speci cation.

The invention relates to a process and apparatus for handling andiapplying abrasive material such as sand to machines usedin grinding plate glass or other substances. Heretofore difliculty has been experienced with vario'us types of graders in securing a mixture of sand which is thick enough pareffective means for accomplishing this functicularly at the beginning of the 'OpGlZitlOll. A mixture which is too thin fails to give the desired s eed in grinding, and when the runners are first brought into contact with the glassa thick mixture produces a cushioning eifect which reduces the danger of breakage due to impact, so that a mixture which is even a little too thick for efiicient grinding is desirable at such time. The

resent invention provides for the thicken- In of the mixture at an time and is applica le toawide range grading apparatus without interfering with the action in the graders. This invention is particularly ,valuable in that type of graders in which the sand is settled in a solid mass in the grader preliminary to its application to the grinding machine, as in such systems the water which is employed in washing the sand loose and carrying it to the grader invariably dilutes or thins the mixture to too great an extent at the beginning of the operation so that it becomes necessary in such systems to use means other than the grader for applying green (unused) sand to the machine to give the necessary amount of sand. Y Even in a suspension system such as that of the Bechtel Patent No. 1,089,895, to which the invention is illustrated as applied in the present case, it is desirable to secure a thicker mixture at the startof the operation, one method of doing this being by the use of additional green sand. illustrated in theapplicatioirof GuW. Oakes, SerialNo. 555,378, and in such systems the present invention provides a cheap and ("ion and also for regulat ng the proportion of" sand tdhwater for the entire series of grades supplied or for any'part' of them witho'utinterfering with the grading action in theconetank employed. One embodi-. ment of the invention is'illustrated in the accompanying drawings wherein:

. Figure 1 is a side elevation, partially in 7 section, showing the complete apparatus and Fig. 2 is a vertical section on an enlarged scale through the concentrating device.

Referring first to the general arrangement of parts as shown in Fig. 1, 1 is a glass grinding table which may be of any approvedtype and driven in the usual mannor, the runners which are employed in connection with the tablenot being shown, but being similar to those commonly em.- ployed in the grinding of plate glass and illustrated in the Bechtel patent referred to; 2 is ,a trough encircling the outer edge of the grinding table and adapted to receive the water and abrasive from such table during the grinding operation; a is a sump or collecting receptacle into which the mixture of sand and water from the trough runs by gravity; his a grader-into which the mix-- ture of sand anilwater from [the sump is lifted by means of'the pump 5 driven from the motor 6';-7 is (a -pipe for conducting the mixture of sand-rand water frijnl the grader to the grinding table; and 8 is a'eoncentrator which receives the mixture :from the pipe 7 and dischargesit ,tothe trough 9 which extends across the grinding table and is provided with a plurality o f'outlet openings through its bottom. Y

The grader illustrated is that shown in the Bechtel patent heretofore referred to. This grader has an overflow pipe 10 through which any mud and sandtoo fine foruse is carried to the sewer 11-. The abrasive in the tank" is graded by the upward flow of mediate the ends of the tank isian overflow to the pipe 17 leading 16 which dischar back to the tro or utter 2. In operation, those grades whi are not being are returned to the sump 3, this being accompletely worn out as the action of the complished by having those ofthe ipes 13," valve-ismerely a throttling one and there Mend lfi'which-are. not in use disc arge to is no requirement for anything but. a rough the box 18 and thence to tlie sump throu'l'r fit. j j I the pi e 19. This particular grader is'o y I What I claim one-.0- aJla-rge' number which might be em- 1. The --proccsso f applying abrasive to a ployed as one of the parts of the apparatus grindingmachine, which consists in color carrying out my improved process cting the abrasive and water, from the ma The concentrator 8' 15 preferably carried chine, returning the m xture to a grader above the center of the table lv upon the and separating the abrasive into a series of framing which supports the runners, and grades, withdrawing therefrom first the as illustrated,-is made in two arts bolted coarsest grade-of abrasive mixed with wa ,tgether as indicated atiZO in int. 2. ,The ter,'flo\ving it to the grinding machine. and

leadinginto the trough emu an overflow, grader to the machine. outlet 23.from which the pipe 24 carries the v casing is rovided with an, inlet 21 to which eliminating a portion of the water in 'such the p ipe 'i' 'diseharges, a discharge outlet 22 withdrawn mixture as it flows from the A 2. The process of applying abrasive to surplus water b'ackto the ditch 2t A valve" a grinding machine, which consists in col- 25 having the threaded stem- 26 serves to doc-ting the abrasive and water from -the regulate the flow through the outlet 22, the machine, returning the mixture to a grader v valve being raised and lowered by means and separating the abrasive into a series ing of the operation. at which time it is grader thecoarsest grade of abrasive sen-- desirable to (:IIShlOll the impact of the ltmgrate from (heather grades and mixed with .outlet Q2, but as the valve is'closed down and the outflow is throttled,- the level in ludi a t bl a t k dj t th tabl, the. on at r rises d pa O the audupted'to contain a su ly of abrasive andpasses out through the water. a conce'ntre tin'g chamber below the .ter from the pipe Overflow O Y f fl t Valve tank having a discharge outlet from its lowof the wheel 2-7 resting upon the tcp'of of grades, withdrawingtherefrom first the the overflow casing. coarsest grade of abrasive mixed with Wa- -The thickness of the mixture discharged tor, d causing the mixture Withdrawn from the concentrator depends upon the t fl vt -thg mmhi b it d d amount of o uining of the valve25. When ing such flow concentrating the mixture by.

this valve is completely open, 'all of the a' settling operation, but without .removm xture from the pipe 7 passes through the ing the abrasive from suspension.

a sufficient extent. any desired thickness of .or portion leading to the tableand an overthe n'uxture may be secured. As stated in fl Quflef, f1f0m its upper portion, means the beginningthis thickening of the mi f l ti th flow fro the dischm-gg ture is particularly desirable at'the bcu'in- -nut]' t me: 1ns for withdrawing from the ncrs even though the grinding .isnot as efter, and a conduit for receiving said i ficient as would he the case with a th nner mm d di hargi g to the chamber at a mixture. The raising and-lowering of the l l i t di mflmt f the. discharge and valve has no effect upon'the function of the overflow outlets.

glltdil l itself, and desired, concentra- In' combination arinding n ah ine in.-

maybe used tlhfmlfihoflt t Operation cludin e' a tablera conical grading tank above to regulate the thickness of the finer grades th t bl a concentrating chamber Jving as well as thatof the coarsest tirade. This bove. the table'and below the tank having latter function becomes more important in a. discharge outlet from it's .lower portion connection with fl which do n t P "leadindto'the table and an overflow outlet Grate as alccm'imtly the Bechtel ype d from its upper portion. meansfor reaulats p r y important in n ti wi ins: the flow from the discharge outlet. and

- graders where the sand is washed from the, d it l di f th ta k 'nd di grader by a stream of water and in which, h in t9 th v h mb t, 1 1 1 inferit becomes if i lt to ol the w r mediate, that otthedischarge and overflow tion of sand and water. The concentrator outletsg v can be cheaply constructed and the cost of. 1 I testimony whereof, Thave hereunto upkeep is low. The lower section oft. the ub ib d y n thi 22 d d y nf.J concentrator and'the valve', which are-the 'j923 fl I only parts to wear are of cheap construe tion andj require replacement only when CHRISTOPHER BROWN, 

